2019-03-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89629
	* libsupc++/hash_bytes.cc (std::_Hash_bytes): Change len_aligned type
	from int to size_t.

--- libstdc++-v3/libsupc++/hash_bytes.cc
+++ libstdc++-v3/libsupc++/hash_bytes.cc
@@ -139,7 +139,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     // Remove the bytes not divisible by the sizeof(size_t).  This
     // allows the main loop to process the data as 64-bit integers.
-    const int len_aligned = len & ~0x7;
+    const size_t len_aligned = len & ~0x7;
     const char* const end = buf + len_aligned;
     size_t hash = seed ^ (len * mul);
     for (const char* p = buf; p != end; p += 8)